Admittedly an old thread, but I thought I'd use it rather than start a new one. Related to this is my question about Adagio's packaging. It looks like the tins have clear lids, and I have always taken the thing about sunlight seriously, even when storing teabags.

Are those lids clear, and if so why? (It has been a factor in my not yet buying larger quantities of Adagio teas.)

But you really don't have to worry too much. Just store all your teas in a cupboard or another dark place. I doubt you'll be leaving your tins in direct sunlight anyways, so you don't really have to worry.